Question

select the correct answer from each drop - down menu.
in medium - sized stars such as the sun, nuclear fusion almost always means the fusing of hydrogen nuclei to form hydrogen, but larger stars can produce elements as heavy as

Explanation:

In medium - sized stars like the Sun, nuclear fusion mainly involves hydrogen nuclei fusing to form helium. Larger stars have higher pressures and temperatures, allowing them to produce heavier elements. Iron is a common end - point for element production in larger stars through successive fusion processes.

Answer:

First blank: hydrogen (already selected correctly as per the problem statement). Second blank: iron.